Most people are so focused on not failing in their lives that they limit themselves and their abilities, without failure you won't be able to grow as fast nor as much. My opinion: fail early, fail fast, and fail often.
Fear can simply be thought of as, False Evidence Appearing Real. Fear is an emotion that causes someone to stop what he or she is trying to accomplish. Most people see fear as a bad thing and stop doing what they are doing because it is dangerous.